CN110113046B - Frequency source wireless synchronization and calibration method for high-resolution radar array system - Google Patents
Frequency source wireless synchronization and calibration method for high-resolution radar array system Download PDFInfo
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- CN110113046B CN110113046B CN201910304335.5A CN201910304335A CN110113046B CN 110113046 B CN110113046 B CN 110113046B CN 201910304335 A CN201910304335 A CN 201910304335A CN 110113046 B CN110113046 B CN 110113046B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000001360 synchronised effect Effects 0.000 claims description 33
- 230000010355 oscillation Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 abstract description 8
- 230000001427 coherent effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
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- Radar, Positioning & Navigation (AREA)
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- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a frequency source wireless synchronization and calibration method for a high-resolution radar array system, which is characterized in that one array module in the array system formed by connecting a plurality of array modules is extracted as a reference frequency source and used for transmitting a radio frequency signal, and the other array modules in the array system receive the reflected reference frequency source signal and inject the reflected reference frequency source signal into the frequency source of the array module so as to synchronize the reference frequency signal with the reflected reference frequency source signal. The invention can transmit frequency signals through the self transmitting unit in the system, all the units in the array system receive the signals simultaneously and are connected with the self corresponding array module frequency source, thereby realizing the synchronization of all the frequency sources in the array system and improving the performances of the coherent radar and the imaging array system.
Description
Technical Field
The invention relates to the technical field of integrated circuits, in particular to a frequency source wireless synchronization and calibration method for a high-resolution radar array system.
Background
In the fields of radar, imaging application and the like, in order to increase the detection distance of the radar and improve the accuracy and resolution of the radar and imaging, the radar and imaging can be obtained by increasing the number of the transceiving units in the system to form an array. When the system array is large in scale, due to the limitations of chip processing size, package pins and the like, multiple array modules are required to be cascaded. For coherent-mode radar and imaging systems, the cascading of multiple array modules will face the problem of asynchronous frequency sources of each transceiver unit in the system. For an array system with only one frequency source, besides the fact that the signal intensity of the frequency source is greatly split by each transceiver unit, the loss and noise coupling of a wide-range distribution network of the frequency source signal can also seriously affect the quality of the frequency source signal; for a multi-frequency source array system, each frequency source will cause the asynchrony of the source frequency and phase due to weak deviation of the process, the array module connection structure and the like. These conditions can cause errors in the information obtained by the transceiver units in the entire system, resulting in degraded system performance.
Disclosure of Invention
The invention aims to provide a frequency source wireless synchronization and calibration method for a high-resolution radar array system aiming at the technical defects in the prior art, and the frequency source synchronization of the array system is realized through self-emission and receiving in the array system.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a frequency source wireless synchronization and calibration method for a high-resolution radar array system is characterized in that one array module in the array system formed by connecting a plurality of array modules is extracted as a reference frequency source and a radio frequency signal is sent, and the other array modules in the array system receive the reflected reference frequency source signal and inject the reflected reference frequency source signal into the frequency source of the array module to enable the reflected reference frequency source signal and the reference frequency signal to be synchronized.
The output of the frequency source in the array module is output as a local oscillation signal in the array module on one hand and is output as a synchronous reference signal when synchronous operation is executed on the other hand through gating;
the synchronous reference signal is transmitted through a transmitter link, a power amplifier and an antenna in the array module; the synchronous reference signal receiving can be carried out through a receiving antenna of a receiver chain in the array module and a low noise amplifier;
when synchronous operation is executed, the synchronous reference signal is input to the synchronous input end of the frequency source through gating, and the frequency source of the array module is synchronous with the synchronous reference signal.
The synchronization with the reference frequency signal can be periodically executed when the array system is in a working state, so that each array module frequency source of the whole array system is in a synchronous state.
Compared with the prior art, the invention has the beneficial effects that:
the wireless self-transmitting and receiving frequency source synchronization method applicable to the high-resolution radar and imaging application array system can transmit frequency signals through the self transmitting unit in the system, all the units in the array system simultaneously receive the signals and are connected with the self corresponding array module frequency source, so that the synchronization of all the frequency sources in the array system is realized, and the performances of a coherent radar and an imaging array system are improved.
Drawings
FIG. 1 is a schematic view of a display module;
FIG. 2 is a schematic diagram of an array system comprising a plurality of array modules;
FIG. 3 is a schematic diagram of a frequency source wireless synchronization method of an array module of an array system;
fig. 4 is a schematic diagram of a frequency source wireless synchronization unit architecture of an array module of the array system.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the method for wireless synchronization and calibration of a frequency source for a high-resolution radar array system according to the present invention extracts one array module 1 in the array system 100 as a reference frequency source and transmits a radio frequency signal, and the other array modules 1 in the system receive a reflected reference frequency source signal and inject the reflected reference frequency source signal into the frequency source of the array module itself to synchronize the reference frequency signal.
As shown in fig. 1-2, by forming the array system 100 by combining the single array modules 1 into an area array, the detection range of the radar can be increased, and the accuracy and resolution of the radar and imaging can be improved. In the process, the frequency sources of the array modules are in a free working state and are irrelevant to each other in frequency and phase, so that the whole array system cannot obtain the performance improvement of the cascade connection of the array modules.
As shown in fig. 1, each array module 1 has a plurality of array module channels (transceiver units CH1-16)3 and a frequency source 2, and as shown in fig. 2, is an array system 100 composed of 5 × 5 array modules 1.
The frequency source wireless synchronization and calibration method for the high-resolution radar array system provided by the invention can synchronize the frequency source in the array system formed by cascading a plurality of array modules, as shown in fig. 3: one array module 1 in the array system is extracted to serve as a reference frequency source and emit radio frequency signals, and the other array modules in the system receive the reference frequency source signals reflected by objects outside the system (or reflecting structures installed on the radar system), and inject the reference frequency source signals into the frequency source of the array module, so that the frequency source and the reference frequency signals are synchronized. The synchronization may be controlled by a system control signal and performed periodically to bring the frequency sources of the entire array system into synchronization.
In the present invention, the wireless synchronization architecture of the frequency source 2 in the array module is shown in fig. 4, and the transmitter chain and the receiver chain can be partially multiplexed with the original transceiver unit in the array module.
The frequency source output in the array module is used as a local oscillation signal output in the module on one hand through gating, and is used as a synchronous reference signal output when synchronous operation is executed on the other hand, and the signal is transmitted through a transmitting link power amplifier and an antenna in the module; the synchronous reference signal receiving can be carried out through a receiving chain receiving antenna and a low noise amplifier in the module, and the synchronous reference signal is input to the synchronous input end of the frequency source through gating when synchronous operation is carried out, so that the frequency source of the module is synchronous with the synchronous reference signal.
Specifically, as shown in fig. 4, when the frequency source wireless synchronization circuit is implemented, the output of the frequency source 2 of the array module selected as a reference is connected with the input of the transmitter chain selector 5 and the power amplifier 4 in the array through the selector 5, and transmits a reference frequency signal to the space through the antenna 6. After the reference frequency signal is reflected, each array module in the whole system is covered, and each module injects the received reference frequency signal into a synchronous input port of the frequency source 2 through an antenna 6 of a receiver link and the low noise amplifier 3, so that the frequency source of the array module is synchronous with the reference frequency source.
The synchronization of the invention can be periodically executed when the array system is in a working state, so that each array module frequency source of the whole system is in a synchronous state.
The invention adopts a frequency source wireless synchronization method, and has the following advantages:
first, the transceiver units in the array system can be reused as the transmitter and receiver in the wireless synchronization of the frequency source, thereby avoiding adding extra circuit structure to the system.
Second, the wireless synchronization method can avoid the complicated routing network caused by the frequency source signal distribution in the system and the accompanying signal power loss.
Thirdly, with frequency source wireless synchronization, the impact of the array system scale on the performance of frequency source synchronization becomes very weak.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (2)
1. The method is characterized in that one array module in the array system formed by connecting a plurality of array modules is extracted as a reference frequency source and used for sending radio frequency signals, and the other array modules in the array system receive reflected reference frequency source signals and inject the reflected reference frequency source signals into the frequency source of the array module per se to synchronize the reflected reference frequency source signals with the reference frequency signals;
the output of the frequency source in the array module is output as a local oscillation signal in the array module on one hand and is output as a synchronous reference signal when synchronous operation is executed on the other hand through gating;
the synchronous reference signal is transmitted through a transmitter link, a power amplifier and an antenna in the array module; the synchronous reference signal receiving can be carried out through a receiver chain, a receiving antenna and a low noise amplifier in the array module;
when synchronous operation is executed, the synchronous reference signal is input to the synchronous input end of the frequency source through gating, and the frequency source of the array module is synchronous with the synchronous reference signal.
2. The method of claim 1, wherein the synchronization with the reference frequency signal is performed periodically while the array system is in operation, such that the frequency sources of the array modules of the entire array system are synchronized.
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| CN112558062A (en) * | 2019-09-25 | 2021-03-26 | 天津大学 | Multi-target vital sign radar detection system based on coding and phased array antenna |
| CN110940957B (en) * | 2019-10-28 | 2022-03-22 | 惠州市德赛西威汽车电子股份有限公司 | Modular millimeter wave radar |
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